Cleaning protocol for dirty glass filters using HNO3 (65%).
- Remove excessive organic material from the filter by means of a spatula.
- Put the glass filter (in the fume hood) in a clamp over a large beaker.
- Put water in the glass filter and let it pass through the filter.
- Discard the water in the acid waste container and rinse the beaker with water.
- Put acetone in the filter and let it pass through the filter.
- Discard the acetone in the non-halogenated waste container.
- Check that all organic solvents are removed from the fume hood.
- Put water in the glass filter and let it pass through the filter (to remove residual acetone in the pores of the filter).
- Discard the water layer in the non-halogenated waste container.
- Clean the beaker and put a large layer of crushed ice in the beaker.
- Put concentrated Nitric acid (65%) in the glass filter and let it pass into the beaker.
- Let the ice melt, and discard the now diluted nitric acid in the acid waste container.
- Put water in the glass filter and let it run through the filter.
- Discard the water layer in the acid waste container.
- Clean the beaker with extra water and let it dry.
